Removing Border on Image Signature

Ok, so. I have been able to successfully remove the image border on posts/pages.

However, I have set up a .png signature, and that still has the border showing up.

Here is a test post for the example: https://guerrillahousewife.com/2015/10/test-post/

You can see the image in the post is borderless, but when you scroll down to the signature, it still has one.